1491894374400 has 1248 divisors, whose sum is σ = 5923469088000. Its totient is φ = 366964899840.

The previous prime is 1491894374389. The next prime is 1491894374419. The reversal of 1491894374400 is 44734981941.

1491894374400 is a `hidden beast` number, since 1 + 4 + 91 + 89 + 4 + 3 + 74 + 400 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1844121196 + ... + 1844122004.

Almost surely, 2^{1491894374400} is an apocalyptic number.

1491894374400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1491894374400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2961734544000).

1491894374400 is an abundant number, since it is smaller than the sum of its proper divisors (4431574713600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1491894374400 is a wasteful number, since it uses less digits than its factorization.

1491894374400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904 (or 871 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 1491894374400 in words is "one trillion, four hundred ninety-one billion, eight hundred ninety-four million, three hundred seventy-four thousand, four hundred".